Saw-sharpening machine



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SAW SHARPENING MACHINE. No. 359,133. Patented Mar. 8, 1887.

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.M. OOVEL. SAW SHARPE-NING MACHINE.

No. 359,133. Patented Mar. 8, 1887.

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SAW SHARPENING MACHINE.

No. 359,133. Patented M51128, 1887.

UNITED STATES PATENT OFFICE.

MILO OOVEL, OF CHICAGO, ILLINOIS.

SAW-=SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 359,133, dated March 8,1887.

Application filed November 16, 1855. Serial No. 1 3,020. (No model.)

To all whom it may concern:

Be it known that I, MILO COVEL, ofGhicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inSaw-Sharpening Machines, of which the following is a full, clear, andexact description, that will enable others to make and use the same,reference being had to the accompanying drawings, forminga part of thisspecification.

This invention relates to improvements in that class of machines setforth in. my Letters Patent No. 819,794, issued on the 9th day of June,1885; and it consists of certain novel features'in the construction,combination, and operation of parts, as will be hereinafter set forth.

Figure 1 is a front elevation of a machine embodying my improvedfeatures; Fig. 2, a plan View of a part of the machine; Fig. 3, apartial side elevation; Figs. L and 5, sectional details; Fig. 6, a Viewin perspective of an ad justable compound cam; Fig. 7, a detachedportion of the same, and Fig. 8 a sectional elevation of the same.

Referring to the drawings, A represents the frame-work supporting thedifferent parts; A, the main drivingshaft,placed on the back part of theframe and supported on the standards a a a"; and A, the emery orsharpening wheel, mounted 011 the arbor A", journaled in the front partof the sweep B, as shown in Figs. 1 and 2. Motion is transmitted to theemerywheel from the pulleys A, A and A.

The sweep B consists of two members, I) Z),

' as shown in Fig. 2, the back ends of which are secured in thestandards a a, just below the journal-bearings of the driving-shaft A,bythe adjustable pivot clamping bolts (6* a, as shown in Figs. 8, 4, and5. The standards a a are each provided with an elongated slot, (6, asshown in Fig. 3, by which means the sweep may be shortened orlengthened, thus moving the emery-wheel forward or back, as may berequired in bringing the same to the proper position relative to thesaw. The adjustingscrews a are inserted from the back part of thestandards a a and have a bearing on the pivot-bolts a a", as shown inFig. 5, whereby the back ends of the sweep B may be adjusted to a fixedposition.

The inner side or member, b, of the sweep 33 is set lower at the backend than the companion member, as shown in Fig. 4. The object in havingone side of the sweep lower than the other is to impart a slight tiltingand lateral movement to the emery-wheel, in order to bring thegrinding-surface of the same square against the face of the saw -toothafter the e1nery-wheel is well down in the gullet. This prevents theedge of the emery-wheel from coming in contact with the point of thetooth at first and rounding off the same before the wheel is steadied.The front end of the sweep B supports the emery-wheel, the same beingprovided with suitable journalbearings therein.

The upper ends of the yoke 13 (shown in Figs. 1 and 3) are detachablysecured to the under side of the sweep B, the lower end of this yokebeing connected to the upper end of the rod B*, the lower end of saidrod being adjustably' connected to the horizontal curved bar 13 bymeansof the clamping-bolt If, inserted through the elongated slot b in saidbar, as shown in Fig. 1. The bar 13 is also provided with the notchedsurface a by which means the lower end of the rod B may be set to anexact position. The outer end of the bar B is pivoted to the post 6*,while the inner end is provided with the jourualed roller If, as shownin Figs. 1, 6, and 8. This roller has a frictional or rolling contactwith the irregular compound cam 0, by which means this end of the bar Bis made to rise and fall, i1n parting a corresponding movement tothesweep and emery-wheel. Shifting the lower end of the rod 13 towardthe compound cam has the effect of raising the emery-wheel higher, andset in the opposite direction shortens the stroke. The irregularcompound cam is composed of three parts, the center part, 0, being thecam proper, which is loosely mounted on its rotating shaft B", as shownin Fig. 8. A second part of this cam consists of the piece 0, pivoted atZ) to the front side of the cam. O, and adjustably secured in relationto the same by the clamping-bolt b inserted through the segmental slot21 in the piece 0 and tapped into the cam proper. By this arrangementthe piece 0 may be set outward to any desired degree and caused toproject beyond the surface of the cam O at one point in theplane ofrotation, as shown in Figs. 6 and 7. hen set outward the piece 0 has theeffect of producing a slimmer tooth with a finer point, and

when set inward a more stubby tooth with a heavier point is the result.This construction readilyenables the operator to conveniently adjust themachine to impart the proper form to the teeth, as may be required inaccordance with the nature ofthc material to be cut, and also when thereis frost in the wood.

The third part of the compound cam is the piece 0', attached to the backside of the same by means of the clampingbolt I)", inserted through thesegmental slot 6 and tapped into the cam O, as shown in Figs. 6 and S.The piece 0 is provided with the hub B", and mounted on the shaft B, andsecured to the same by the set-screw b. The raised sharp surface (I onthe part 0 forms a guide for the shifting and the setting of the cam O,which is provided on that side with the scale of gradir ating-lines (2.By slacking back the bolt Z), the cam C may be rolled either backward orforward on its shaft and set to any desired degree or position. By thisarrangement the size of the gullet in the saw-plate between the teeth isdetermined and gaged, the cam C being rolled or set in one direction toproduce a smaller gullet or throat and in the opposite direction for alarger gullet. The shaft B extends from the front to the back end of themachine at right angles to the main drivingshaflt and is journaled inthe supporting framewor z. i

The cam D is mounted on the projecting front end of the shaft B and isprovided with the continuous groove d as shown in Figs. 1 and 8. Theinner end of the lever D is provided with a roller, as indicated bydotted lines, which has a rolling engagement in the groove d as the camrevolves. The opposite end of this lever is pivoted to the lower end ofthe curved swinging bar D", the upper end of said bar being loose, so asto admit ofaswinging movement on its pivot. This bar is provided withthe elongated slot (1 and the notched rack-surface d, so thattheconnecting end of the rod D may be conveniently adj usted or set to apositive position relative to the barD". The opposite end of theconnecting-rod D is pivoted to the feed-arm Dflwhich is in turn pivotedat the lower end to the frame. The back end of the feed-finger d ispivoted to the upper end of the feed-arm, the loose end of saidfeed-finger being adapted to engage with the teeth of the saw and feedthe same forward in regular order as the process of sharpeningprogresses. Motion is communieated to said feed-finger from the groovedcam D through the intermediate connections described. By lowering theend of the rod D connected to the bar D the throw of the feedfinger isshortened, while by raising the same the throw is lengthened, thusenabling the proper adjustment to be conveniently and quickly made fordifferent saws. The saw is supported on the spindle d and clampedbetween the two collars thereon, as shown in Fig. 1. The slide d isconnected with said spindle and the horizontal screw-shaft (1 by whichmeans a lateral adjustment is given to these parts to bring them to theproper horizontal position. The vertical adjustment of the saw isaccomplished through the medium of the vertical screw-shafts E E, motionbeing transmitted from one to the other by the shaft E", having beveledpinions mounted on each end and engaging with corresponding pinions onthe shafts E E. The cross-bar E has a threaded engagement with saidvertical screwshafts.

E is an adjustable device for clamping and stiffening the saw-plate nearthe edge.

One end of the spring F (shown in Figs. 1, W

2, and 3) is connected to the sweep B, the opposite or lower end beinghooked in one of the notches of the rack-bar F. The function of thisspring is to assist in the movement of the sweep when it is necessary tooperate the same by hand. \Vhen the machine is operated by power,theloose end of the springis disengaged from the rack-bar. Motion istransmitted from the main driving-shaft to the shaft 13* through themedium of the pulley H, mounted on said main shaft and having a beltedconnec tion with the pulley H on the shaft H". (Indicated by dottedlines in Fig. 1.) The shaft H is provided on one end with the pinion 71,also shown in dotted lines, which engages with the gear-wheel H mountedon the shaft B.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a saw-sharpening machine, a sweep supporting a grinding-wheel inthe front end and provided with pivotal bearings at the back end, andhaving an endwise adjustment, as described, in combination with thespring F and ineans for supporting the loose end of said spring,substantially as and for the purpose set forth.

2. In a saw-sharpening machine, a sweep consisting of the members I) I),provided with pivotal bearings at the back ends and having one of thesides or members comprising said sweep set at a lower point than thecompanion member, substantially as and for thepurpose set forth.

3. In a saw-sharpening machine, the combination, with a sweep consistingof the members b b, of the standards a a, provided with the elongatedslot (t the pivotal bolts a a", and the adjusting screw or screws a,whereby said sweep is adapted to have an endwise adjustment,substantially as and for the purpose set forth.

4.. In a saw-sharpening machine, the combination, with a sweep, asdescribed, having the pivotal bearing of one side lower than that of thecompanion side, of an emery or grinding wheel journaled in the front endof said sweep, substantially as set forth.

5. In a saw-sharpening machine, the combination, with a sweep providedwith pivotal bearings at one end and supporting a j ournaledgrinding-wheel in the opposite end, of the yoke B, the rod B the curvedbar B pro= vided with an elongated slot and a notched surface, asdescribed, the roller b the cam O, and the shaft 13*, whereby therequired movementis imparted to the sweep and grindingwheel,substantially as set forth.

6. In a saw-sharpening machine, a compound cam consisting of the part 0,provided on the back side with graduating lines and loosely mounted uponits rotating shaft, the part 0, adjustably secured in relation to thepart C, and the part 0 rigidly mounted on its shaft and provided withmeans for securing said part (3 to the part 0, whereby the latter may beadjusted to any desired position, in combination with the shaft B, thebar 13 provided with the roller If, the sweep B, and the means describedfor connecting said bar and sweep, substantially as and for the purposeset forth.

7. In a saw-sharpening machine, the com- 20 bination, with the groovedcam D, mounted upon the outer end of the rotating shaft B, of the leverD, having a roller engagement with said cam, the swinging bar D the rodD the feed-arm D, and the feed-finger d substan- 25 tially as and forthe purpose set forth.

8. In a saw-sharpening machine, the combination, with the curvedswinging bar D provided with the elongated slot (1 and the notchedrack-surface (1*, of the connecting-rod D the feed-arm D", and thefeed-finger (1 whereby the throw of said finger may be lengthened orshortened, as required, substantially as set forth.

MILO COVEL. Vitnesses: L. M. FREEMAN, L. B. GOUPLAND.

